Commonwealth Games 800m champion Mary Moraa kickstarted her Diamond League campaign strongly by successfully defending her title in Rabat after clocking a season's best of 1:58.72.
Moraa led from start to finish, tucking behind the pacemaker and clocked halfway in 56.45 seconds on her way to victory. She beat Australia's Catriona Bissett for second in 2:00.11. American Sage Hurta-Klecker finished third in a season's best of 2:00.62.
Elsewhere, Commonwealth 100m champion and Africa's fastest man Ferdinand Omanyala failed to live up to his promises of not losing the sprint race this year as he conceded defeat to America's Fred Kerley.
Despite a slow start, Kerley, the world champion, dug deep to take the lead halfway through and went on to win in a new meet record of 9.94.
Former African champion South Africa's Akani Simbine clocked 9.99 for second as Omanyala settled for third in 10.05.
World under-20 champion Letsile Tebogo finished fourth in a season's best of 10.09 while Trayvon Bromell finished fifth in 10.10.
In the 800m men's category, Emmanuel Wanyonyi outsmarted compatriot Wycliffe Kinyamal for the second consecutive time to win the race in 1:44.36. Kinyamal clocked 1:44.73 for second while England's Robert Benjamin settled for bronze in 1:45.04.
In the men's 3000m steeplechase, Olympic and world champion Soufiane El Bakkali shone in front of home fans as he shattered his own meet record and set a new personal best as he stormed to a 7:56.68 to retain the title.
Ethiopia's Getnet Wale (8:05.15) and Kenya's Abraham Kibiwot (8:05.51) settled for second and third respectively.
Norwegian Jacob Ingebrigtsen won the men's 1,500m race in 3:32.59 while Kenya's Abel Kipsang (3:34.46) finished fifth.
In the women's category, Ethiopia's Gudaf Tsegay set a world lead and a new meet record of 3:54.03. Ethiopia snatched the top four positions through Freweyni Hailu (3:57.65), Birke Haylom (PB 3:57.66) and Worknesh Mesele (4:01.81).
